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Hibernate（六）：映射一对多关联关系、双向一对多映射

在领域模型中，类与类之间最普通的关系就是关联关系。

在UML中，关联是有方向的：

　　例如：Customer与Order，一个用户能发出多个订单，而一个订单只能属于一个用户。

单向关联

　　1）从Order到Customer的关联是多对一关联；

定义Customer：

 1 package com.dx.hibernate.onetomany;
 2 
 3 public class Customer {
 4     private Integer customerId;
 5     private String customerName;
 6 
 7     public Customer() {
 8     }
 9 
10     public Customer(String customerName) {
11         super();
12         this.customerName = customerName;
13     }
14 
15     public Integer getCustomerId() {
16         return customerId;
17     }
18 
19     public void setCustomerId(Integer customerId) {
20         this.customerId = customerId;
21     }
22 
23     public String getCustomerName() {
24         return customerName;
25     }
26 
27     public void setCustomerName(String customerName) {
28         this.customerName = customerName;
29     }
30 }

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2017-5-24 12:02:56 by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping>
    <class name="com.dx.hibernate.onetomany.Customer" table="CUSTOMER">
        <id name="customerId" type="java.lang.Integer">
            <column name="CUSTOMER_ID" />
            <generator class="native" />
        </id>
        <property name="customerName" type="java.lang.String">
            <column name="CUSTOMER_NAME" />
        </property>
    </class>
</hibernate-mapping>

定义Order：

package com.dx.hibernate.onetomany;

public class Order {
    private Integer orderId;
    private String orderName;
    private Customer customer;

    public Integer getOrderId() {
        return orderId;
    }

    public void setOrderId(Integer orderId) {
        this.orderId = orderId;
    }

    public String getOrderName() {
        return orderName;
    }

    public void setOrderName(String orderName) {
        this.orderName = orderName;
    }

    public Customer getCustomer() {
        return customer;
    }

    public void setCustomer(Customer customer) {
        this.customer = customer;
    }
}

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2017-5-24 12:02:56 by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping>
    <class name="com.dx.hibernate.onetomany.Order" table="ORDERS">
        <id name="orderId" type="java.lang.Integer">
            <column name="ORDER_ID" />
            <generator class="assigned" />
        </id>
        <property name="orderName" type="java.lang.String">
            <column name="ORDER_NAME" />
        </property>
        <many-to-one name="customer" class="com.dx.hibernate.onetomany.Customer">
            <column name="CUSTOMER_ID" />
        </many-to-one>
    </class>
</hibernate-mapping>

初始化项目时，生成sql语句：

Hibernate: 

create table CUSTOMER (
　　CUSTOMER_ID integer not null auto_increment,
　　CUSTOMER_NAME varchar(255),
　　primary key (CUSTOMER_ID)
) engine=InnoDB
Hibernate: 

create table ORDERS (
　　ORDER_ID integer not null auto_increment,
　　ORDER_NAME varchar(255),
　　CUSTOMER_ID integer,
　　primary key (ORDER_ID)
) engine=InnoDB
Hibernate: 

alter table ORDERS 
add constraint FKkdbly1ij6f4kqh378kfne6ilx 
foreign key (CUSTOMER_ID) 
references CUSTOMER (CUSTOMER_ID)

测试代码1：

package com.dx.hibernate.onetomany;

import static org.junit.Assert.fail;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.boot.Metadata;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.model.naming.ImplicitNamingStrategyComponentPathImpl;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class TestMain {
    private SessionFactory sessionFactory = null;
    private Session session = null;
    private Transaction transaction = null;

    @Before
    public void init() {
        StandardServiceRegistry standardRegistry = new StandardServiceRegistryBuilder().configure().build();
        Metadata metadata = new MetadataSources(standardRegistry).getMetadataBuilder().applyImplicitNamingStrategy(ImplicitNamingStrategyComponentPathImpl.INSTANCE).build();

        sessionFactory = metadata.getSessionFactoryBuilder().build();
        session = sessionFactory.getCurrentSession();
        transaction = session.beginTransaction();
    }

    @Test
    public void test() {
        Customer customer = new Customer("customer1");
        Order order1 = new Order("order1", customer);
        Order order2 = new Order("order2", customer);

        session.save(customer);
        session.save(order1);
        session.save(order2);
    }

    @After
    public void destory() {
        transaction.commit();
        session.close();
        sessionFactory.close();
    }
}

测试执行sql:

Hibernate: 
    insert 
    into
        CUSTOMER
        (CUSTOMER_NAME) 
    values
        (?)
Hibernate: 
    insert 
    into
        ORDERS
        (ORDER_NAME, CUSTOMER_ID) 
    values
        (?, ?)
Hibernate: 
    insert 
    into
        ORDERS
        (ORDER_NAME, CUSTOMER_ID) 
    values
        (?, ?)

测试代码2：

    @Test
    public void test() {
        Order order = (Order) session.get(Order.class, 1);
        
        System.out.println(order.getOrderName());
        System.out.println(order.getCustomer().getCustomerName());
    }

测试结果：

测试通过，且查询语句为：

Hibernate: 
    select
        order0_.ORDER_ID as ORDER_ID1_1_0_,
        order0_.ORDER_NAME as ORDER_NA2_1_0_,
        order0_.CUSTOMER_ID as CUSTOMER3_1_0_ 
    from
        ORDERS order0_ 
    where
        order0_.ORDER_ID=?
order1
Hibernate: 
    select
        customer0_.CUSTOMER_ID as CUSTOMER1_0_0_,
        customer0_.CUSTOMER_NAME as CUSTOMER2_0_0_ 
    from
        CUSTOMER customer0_ 
    where
        customer0_.CUSTOMER_ID=?
customer1

测试代码3：

    @Test
    public void test() {
        Order order = (Order) session.get(Order.class, 1);
        
        System.out.println(order.getOrderName());
        //System.out.println(order.getCustomer().getCustomerName());
        
        session.close();

        System.out.println(order.getCustomer().getCustomerName());
    }

测试结果不通过，执行sql语句:

Hibernate: 
    select
        order0_.ORDER_ID as ORDER_ID1_1_0_,
        order0_.ORDER_NAME as ORDER_NA2_1_0_,
        order0_.CUSTOMER_ID as CUSTOMER3_1_0_ 
    from
        ORDERS order0_ 
    where
        order0_.ORDER_ID=?
order1

测试4：

修改Order.hbm.xml

        <many-to-one name="customer" class="com.dx.hibernate.onetomany.Customer" fetch="join">
            <column name="CUSTOMER_ID" />
        </many-to-one>

测试代码：

         Order order = (Order) session.get(Order.class, 1);
        
         System.out.println(order.getOrderName());
         System.out.println(order.getCustomer().getCustomerName());

测试通过，打印的sql语句：

Hibernate: 
    select
        order0_.ORDER_ID as ORDER_ID1_1_0_,
        order0_.ORDER_NAME as ORDER_NA2_1_0_,
        order0_.CUSTOMER_ID as CUSTOMER3_1_0_,
        customer1_.CUSTOMER_ID as CUSTOMER1_0_1_,
        customer1_.CUSTOMER_NAME as CUSTOMER2_0_1_ 
    from
        ORDERS order0_ 
    left outer join
        CUSTOMER customer1_ 
            on order0_.CUSTOMER_ID=customer1_.CUSTOMER_ID 
    where
        order0_.ORDER_ID=?

测试代码5：

修改Order.hbm.xml

        <many-to-one name="customer" class="com.dx.hibernate.onetomany.Customer" fetch="join">
            <column name="CUSTOMER_ID" />
        </many-to-one>

测试代码：

         Order order = (Order) session.get(Order.class, 1);
        
         System.out.println(order.getOrderName());
         System.out.println(order.getCustomer().getCustomerName());
        
         session.close();
        
         System.out.println(order.getCustomer().getCustomerName());

测试不通过。

　　2）从Customer到Order的关联是一对多关联。

Order.java

 1 package com.dx.hibernate.onetomany;
 2 
 3 public class Order {
 4     private Integer orderId;
 5     private String orderName;
 6 
 7     public Order() {
 8         super();
 9     }
10 
11     public Order(String orderName) {
12         super();
13         this.orderName = orderName;
14     }
15 
16     public Integer getOrderId() {
17         return orderId;
18     }
19 
20     public void setOrderId(Integer orderId) {
21         this.orderId = orderId;
22     }
23 
24     public String getOrderName() {
25         return orderName;
26     }
27 
28     public void setOrderName(String orderName) {
29         this.orderName = orderName;
30     }
31 
32 }

View Code

Order.hbm.xml

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 3 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 4 <!-- Generated 2017-5-25 22:09:21 by Hibernate Tools 3.5.0.Final -->
 5 <hibernate-mapping>
 6     <class name="com.dx.hibernate.onetomany.Order" table="ORDERS">
 7         <id name="orderId" type="java.lang.Integer">
 8             <column name="ORDER_ID" />
 9             <generator class="native" />
10         </id>
11         <property name="orderName" type="java.lang.String">
12             <column name="ORDER_NAME" />
13         </property>
14     </class>
15 </hibernate-mapping>

View Code

Customer.java

 1 package com.dx.hibernate.onetomany;
 2 
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 
 6 public class Customer {
 7     private Integer customerId;
 8     private String customerName;
 9     private List<Order> orders = new ArrayList<Order>();
10 
11     public Customer() {
12     }
13 
14     public Customer(String customerName) {
15         super();
16         this.customerName = customerName;
17     }
18 
19     public Integer getCustomerId() {
20         return customerId;
21     }
22 
23     public void setCustomerId(Integer customerId) {
24         this.customerId = customerId;
25     }
26 
27     public String getCustomerName() {
28         return customerName;
29     }
30 
31     public void setCustomerName(String customerName) {
32         this.customerName = customerName;
33     }
34 
35     public List<Order> getOrders() {
36         return orders;
37     }
38 
39     public void setOrders(List<Order> orders) {
40         this.orders = orders;
41     }
42 }

View Code

Customer.hbm.xml

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 3 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 4 <!-- Generated 2017-5-25 22:09:21 by Hibernate Tools 3.5.0.Final -->
 5 <hibernate-mapping>
 6     <class name="com.dx.hibernate.onetomany.Customer" table="CUSTOMER">
 7         <id name="customerId" type="java.lang.Integer">
 8             <column name="CUSTOMER_ID" />
 9             <generator class="native" />
10         </id>
11         <property name="customerName" type="java.lang.String">
12             <column name="CUSTOMER_NAME" />
13         </property>
14         <list name="orders" inverse="false" table="ORDERS" lazy="true">
15             <key>
16                 <column name="CUSTOMER_ID" />
17             </key>
18             <list-index></list-index>
19             <one-to-many class="com.dx.hibernate.onetomany.Order" />
20         </list>
21     </class>
22 </hibernate-mapping>

TestMain.java

package com.dx.hibernate.onetomany;

import static org.junit.Assert.fail;

import java.util.List;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.boot.Metadata;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.model.naming.ImplicitNamingStrategyComponentPathImpl;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.query.Query;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class TestMain {
    private SessionFactory sessionFactory = null;
    private Session session = null;
    private Transaction transaction = null;

    @Before
    public void init() {
        StandardServiceRegistry standardRegistry = new StandardServiceRegistryBuilder().configure().build();
        Metadata metadata = new MetadataSources(standardRegistry).getMetadataBuilder().applyImplicitNamingStrategy(ImplicitNamingStrategyComponentPathImpl.INSTANCE).build();

        sessionFactory = metadata.getSessionFactoryBuilder().build();
        session = sessionFactory.getCurrentSession();
        transaction = session.beginTransaction();
    }

    @SuppressWarnings("deprecation")
    @Test
    public void test() {
         Order order1 = new Order("order1");
         Order order2 = new Order("order2");
         Customer customer = new Customer("customer1");
         customer.getOrders().add(order1);
         customer.getOrders().add(order2);
        
         session.save(customer);
         session.save(order1);
         session.save(order2);

        Customer customerFetch = (Customer) session.get(Customer.class, 1);

        System.out.println(customerFetch.getCustomerName());
        System.out.println(customerFetch.getOrders().size());

    }

    @After
    public void destory() {
        transaction.commit();
        session.close();
        sessionFactory.close();
    }
}

测试结果：通过，打印信息如下：

INFO: HHH10001501: Connection obtained from JdbcConnectionAccess [org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess@320e400] for (non-JTA) DDL execution was not in auto-commit mode; the Connection 'local transaction' will be committed and the Connection will be set into auto-commit mode.
Hibernate: 
    
    create table CUSTOMER (
       CUSTOMER_ID integer not null auto_increment,
        CUSTOMER_NAME varchar(255),
        primary key (CUSTOMER_ID)
    ) engine=InnoDB
Hibernate: 
    
    create table ORDERS (
       ORDER_ID integer not null auto_increment,
        ORDER_NAME varchar(255),
        CUSTOMER_ID integer,
        orders_ORDER integer,
        primary key (ORDER_ID)
    ) engine=InnoDB
Hibernate: 
    
    alter table ORDERS 
       add constraint FKkdbly1ij6f4kqh378kfne6ilx 
       foreign key (CUSTOMER_ID) 
       references CUSTOMER (CUSTOMER_ID)
Hibernate: 
    insert 
    into
        CUSTOMER
        (CUSTOMER_NAME) 
    values
        (?)
Hibernate: 
    insert 
    into
        ORDERS
        (ORDER_NAME) 
    values
        (?)
Hibernate: 
    insert 
    into
        ORDERS
        (ORDER_NAME) 
    values
        (?)
customer1
2
Hibernate: 
    update
        ORDERS 
    set
        CUSTOMER_ID=?,
        orders_ORDER=? 
    where
        ORDER_ID=?
Hibernate: 
    update
        ORDERS 
    set
        CUSTOMER_ID=?,
        orders_ORDER=? 
    where
        ORDER_ID=?

双向关联

Order.java

 1 package com.dx.hibernate.onetomany;
 2 
 3 public class Order {
 4     private Integer orderId;
 5     private String orderName;
 6     private Customer customer;
 7 
 8     public Order() {
 9         super();
10     }
11 
12     public Order(String orderName) {
13         super();
14         this.orderName = orderName;
15     }
16 
17     public Integer getOrderId() {
18         return orderId;
19     }
20 
21     public void setOrderId(Integer orderId) {
22         this.orderId = orderId;
23     }
24 
25     public String getOrderName() {
26         return orderName;
27     }
28 
29     public void setOrderName(String orderName) {
30         this.orderName = orderName;
31     }
32 
33     public Customer getCustomer() {
34         return customer;
35     }
36 
37     public void setCustomer(Customer customer) {
38         this.customer = customer;
39     }
40 
41 }

View Code

Order.hbm.xml

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 3 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 4 <!-- Generated 2017-5-25 22:09:21 by Hibernate Tools 3.5.0.Final -->
 5 <hibernate-mapping>
 6     <class name="com.dx.hibernate.onetomany.Order" table="ORDERS">
 7         <id name="orderId" type="java.lang.Integer">
 8             <column name="ORDER_ID" />
 9             <generator class="native" />
10         </id>
11         <property name="orderName" type="java.lang.String">
12             <column name="ORDER_NAME" />
13         </property>
14         <many-to-one name="customer" class="com.dx.hibernate.onetomany.Customer" lazy="proxy">
15             <column name="CUSTOMER_ID"></column>
16         </many-to-one>
17     </class>
18 </hibernate-mapping>

View Code

Customer.java

 1 package com.dx.hibernate.onetomany;
 2 
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 
 6 public class Customer {
 7     private Integer customerId;
 8     private String customerName;
 9     private List<Order> orders = new ArrayList<Order>();
10 
11     public Customer() {
12     }
13 
14     public Customer(String customerName) {
15         super();
16         this.customerName = customerName;
17     }
18 
19     public Integer getCustomerId() {
20         return customerId;
21     }
22 
23     public void setCustomerId(Integer customerId) {
24         this.customerId = customerId;
25     }
26 
27     public String getCustomerName() {
28         return customerName;
29     }
30 
31     public void setCustomerName(String customerName) {
32         this.customerName = customerName;
33     }
34 
35     public List<Order> getOrders() {
36         return orders;
37     }
38 
39     public void setOrders(List<Order> orders) {
40         this.orders = orders;
41     }
42 }

View Code

Customer.hbm.xml

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 3 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 4 <!-- Generated 2017-5-25 22:09:21 by Hibernate Tools 3.5.0.Final -->
 5 <hibernate-mapping>
 6     <class name="com.dx.hibernate.onetomany.Customer" table="CUSTOMER">
 7         <id name="customerId" type="java.lang.Integer">
 8             <column name="CUSTOMER_ID" />
 9             <generator class="native" />
10         </id>
11         <property name="customerName" type="java.lang.String">
12             <column name="CUSTOMER_NAME" />
13         </property>
14         <list name="orders" inverse="false" table="ORDERS" lazy="true">
15             <key>
16                 <column name="CUSTOMER_ID" />
17             </key>
18             <list-index></list-index>
19             <one-to-many class="com.dx.hibernate.onetomany.Order" />
20         </list>
21     </class>
22 </hibernate-mapping>

View Code

测试1

 1 package com.dx.hibernate.onetomany;
 2 
 3 import static org.junit.Assert.fail;
 4 
 5 import java.util.List;
 6 
 7 import org.hibernate.Session;
 8 import org.hibernate.SessionFactory;
 9 import org.hibernate.Transaction;
10 import org.hibernate.boot.Metadata;
11 import org.hibernate.boot.MetadataSources;
12 import org.hibernate.boot.model.naming.ImplicitNamingStrategyComponentPathImpl;
13 import org.hibernate.boot.registry.StandardServiceRegistry;
14 import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
15 import org.hibernate.query.Query;
16 import org.junit.After;
17 import org.junit.Before;
18 import org.junit.Test;
19 
20 public class TestMain {
21     private SessionFactory sessionFactory = null;
22     private Session session = null;
23     private Transaction transaction = null;
24 
25     @Before
26     public void init() {
27         StandardServiceRegistry standardRegistry = new StandardServiceRegistryBuilder().configure().build();
28         Metadata metadata = new MetadataSources(standardRegistry).getMetadataBuilder().applyImplicitNamingStrategy(ImplicitNamingStrategyComponentPathImpl.INSTANCE).build();
29 
30         sessionFactory = metadata.getSessionFactoryBuilder().build();
31         session = sessionFactory.getCurrentSession();
32         transaction = session.beginTransaction();
33     }
34 
35     @SuppressWarnings("deprecation")
36     @Test
37     public void test() {
38          Order order1 = new Order("order1");
39          Order order2 = new Order("order2");
40          Customer customer = new Customer("customer1");
41          customer.getOrders().add(order1);
42          customer.getOrders().add(order2);
43         
44          session.save(customer);
45          session.save(order1);
46          session.save(order2);
47 
48         Customer customerFetch = (Customer) session.get(Customer.class, 1);
49 
50         System.out.println(customerFetch.getCustomerName());
51         System.out.println(customerFetch.getOrders().size());
52 
53     }
54 
55     @After
56     public void destory() {
57         transaction.commit();
58         session.close();
59         sessionFactory.close();
60     }
61 }

View Code

测试打印信息：

Hibernate: 
    
    create table CUSTOMER (
       CUSTOMER_ID integer not null auto_increment,
        CUSTOMER_NAME varchar(255),
        primary key (CUSTOMER_ID)
    ) engine=InnoDB
Hibernate: 
    
    create table ORDERS (
       ORDER_ID integer not null auto_increment,
        ORDER_NAME varchar(255),
        CUSTOMER_ID integer,
        orders_ORDER integer,
        primary key (ORDER_ID)
    ) engine=InnoDB
Hibernate: 
    
    alter table ORDERS 
       add constraint FKkdbly1ij6f4kqh378kfne6ilx 
       foreign key (CUSTOMER_ID) 
       references CUSTOMER (CUSTOMER_ID)
Hibernate: 
    insert 
    into
        CUSTOMER
        (CUSTOMER_NAME) 
    values
        (?)
Hibernate: 
    insert 
    into
        ORDERS
        (ORDER_NAME, CUSTOMER_ID) 
    values
        (?, ?)
Hibernate: 
    insert 
    into
        ORDERS
        (ORDER_NAME, CUSTOMER_ID) 
    values
        (?, ?)
customer1
2
Hibernate: 
    update
        ORDERS 
    set
        CUSTOMER_ID=?,
        orders_ORDER=? 
    where
        ORDER_ID=?
Hibernate: 
    update
        ORDERS 
    set
        CUSTOMER_ID=?,
        orders_ORDER=? 
    where
        ORDER_ID=?

测试2：

    @Test
    public void testUpdate(){
        Customer customerFetch = (Customer) session.get(Customer.class, 1);
        customerFetch.getOrders().listIterator().next().setOrderName("ABC");
    }

测试输出：

Hibernate: 
    select
        customer0_.CUSTOMER_ID as CUSTOMER1_0_0_,
        customer0_.CUSTOMER_NAME as CUSTOMER2_0_0_ 
    from
        CUSTOMER customer0_ 
    where
        customer0_.CUSTOMER_ID=?
Hibernate: 
    select
        orders0_.CUSTOMER_ID as CUSTOMER3_1_0_,
        orders0_.ORDER_ID as ORDER_ID1_1_0_,
        orders0_.orders_ORDER as orders_O4_0_,
        orders0_.ORDER_ID as ORDER_ID1_1_1_,
        orders0_.ORDER_NAME as ORDER_NA2_1_1_,
        orders0_.CUSTOMER_ID as CUSTOMER3_1_1_ 
    from
        ORDERS orders0_ 
    where
        orders0_.CUSTOMER_ID=?
Hibernate: 
    update
        ORDERS 
    set
        ORDER_NAME=?,
        CUSTOMER_ID=? 
    where
        ORDER_ID=?

测试3：

    @Test
    public void testRemove() {
        Customer customerFetch = (Customer) session.get(Customer.class, 2);
        Order order = customerFetch.getOrders().listIterator().next();
        session.remove(order);
    }

测试输出：

Hibernate: 
    select
        customer0_.CUSTOMER_ID as CUSTOMER1_0_0_,
        customer0_.CUSTOMER_NAME as CUSTOMER2_0_0_ 
    from
        CUSTOMER customer0_ 
    where
        customer0_.CUSTOMER_ID=?
Hibernate: 
    select
        orders0_.CUSTOMER_ID as CUSTOMER3_1_0_,
        orders0_.ORDER_ID as ORDER_ID1_1_0_,
        orders0_.orders_ORDER as orders_O4_0_,
        orders0_.ORDER_ID as ORDER_ID1_1_1_,
        orders0_.ORDER_NAME as ORDER_NA2_1_1_,
        orders0_.CUSTOMER_ID as CUSTOMER3_1_1_ 
    from
        ORDERS orders0_ 
    where
        orders0_.CUSTOMER_ID=?
Hibernate: 
    delete 
    from
        ORDERS 
    where
        ORDER_ID=?

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原文地址：https://www.cnblogs.com/yy3b2007com/p/6898489.html